<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app"></div>

  <template id="my-app">
    <h2 v-show="isShow">哈哈哈</h2>
    <h2 v-if="isShow">呵呵呵</h2>
  </template>

  <script src="../js/vue.js"></script>

  <script>
    const App = {
      template: "#my-app",
      data() {
        return {
          isShow: false
        }
      },
      methods: {

      }
    }

    Vue.createApp(App).mount("#app");
  </script>
</body>

</html>